I survived 2/5 campaigns on expert. Then: 0/5. Tried again and had 1/5 yesterday. But today it is 0/5 again. But i still have the achievement "The Real Deal" (got yesterday) Also "The Quick and the Dead" has now 0/10 but I had 8/10.
This is now the third time and I'm REALLY REALLY♥♥♥♥♥♥♥♥off!!! It is so annoying, and I dont' want to play L4D anymore if this is not gonna be fixed. Damned, do something! Do you also have this problem?